How do we safely determine a substance pH?

What do indicators do when exposed to solutions of different pH values?

• Change temperature

• Change color

• Change volume

• Change viscosity

What color does methyl orange turn in a solution with a pH of 7?

• Yellow

• Blue

• Red

• Green

Which indicator would be ideal to observe a pH change from 5 to 8?

• Phenolphthalein

• Bromothymol blue

• Methyl orange

• Litmus paper

A solution turns bright pink when tested with phenolphthalein. Is the solution acidic, basic, or neutral?

• Acidic

• Basic

• Neutral

• Cannot be determined

If a solution initially bright pink turns clear upon adding another solution, what can be inferred about the added solution?

• It is basic

• It has no effect on pH

• It is acidic

• It is neutral